Affordable and Long-lasting Lithium-ion Batteries Made with 'Cheongbaji' Dye!

Prussian Blue and Electrolyte Combine to Maintain Battery Performance Over 500 Cycles

UNIST Professor Hyunwook Lee's Team Develops Stable High-Output Next-Generation Battery Material

Prussian Blue, well known as a dye for denim jeans, is emerging as a next-generation battery material.

A research team at UNIST has developed a low-cost, high-performance lithium-ion battery using Prussian Blue, discovering a way to reduce battery costs.

The team led by Professor Lee Hyunwook from the Department of Energy and Chemical Engineering at UNIST (President Lee Yonghoon) utilized Prussian Blue as a cathode material, significantly enhancing battery performance while developing an affordable lithium secondary battery system. They maximized performance by combining the advantages of organic and aqueous electrolytes used in conventional batteries.

The improved electrolyte removes water molecules during battery operation and forms a stable protective layer on the surface of Prussian Blue. This enables the battery to maintain a stable capacity (125mAh/g) even after more than 500 cycles. The new electrolyte greatly enhances the battery's durability, allowing for stable operation at high output.

Securing the structural stability of Prussian Blue and enhancing high-power characteristics through stable coating layer formation via electrolyte design.

Previously, Prussian Blue cathode materials had limitations in energy density and lifespan performance due to slow reaction rates or structural instability in organic electrolytes. However, by addressing these issues, the usability of Prussian Blue can be increased, enabling the production of affordable yet efficient battery materials.

Lithium transition metal oxides, the main cathode materials for lithium-ion batteries, contain cobalt and nickel. As the prices of these resources have risen, battery prices have also soared. This is why lithium iron phosphate, which contains inexpensive iron, has attracted attention.

Prussian Blue is an inexpensive material composed of iron, carbon, and nitrogen, with low production costs and high ionic conductivity, allowing it to accommodate various ions. Thanks to these characteristics, it is being spotlighted as a next-generation battery material. However, there have been limitations in utilizing lithium, so research has been limited.

As an affordable and efficient cathode material, Prussian Blue has shown the potential to significantly lower the price of lithium-ion batteries. Through improvements in electrolytes, its performance can be optimized, overcoming the limitations of Prussian Blue and enabling its application in various battery fields.

Hyunwook Lee Professor.

Professor Lee Hyunwook stated, "By transforming Prussian Blue, which was previously overlooked in conventional lithium-ion battery systems, into an attractive low-cost cathode material, the paradigm of developing affordable cathode materials may change."

First author Wi Taeung, a researcher, emphasized, "Through this study, not only have we overcome the limitations of conventional Prussian Blue, but we can also contribute to the development of more efficient and stable batteries in the future."

First author Park Changhyun, a researcher, highlighted the significance by saying, "This is the first study to stably operate Prussian Blue in a lithium aqueous-based electrolyte containing water molecules."

This research was supported by the Mid-career Researcher Support Program of the National Research Foundation of Korea and was published in the international journal Nano Letters in the field of nanoscience on June 13.

This content was produced with the assistance of AI translation services.